rain water

Firstly I'd like to say HELLO :-D to everybody, I am new have never posted before but have already learned loads from the wealth of information here. Something I couldn't find was much information on rain water so I was hoping somebody out there might be able to enlighten me. Here goes.... I am...

i live on a farm and use tank water considering that the water is rain water and has been sitting in the tank for weeks or even more will fishless cycling be the same for me? this is something i cant find information on anywhere!! there are no heavy metals (we have had it tested) or chlorine in...